TW201528633A - Cover processing tool, power cable connection structure, power cable connection structure assembly method and terminal processing method - Google Patents

Abstract

To provide a cover processing tool capable of enhancing cable holding functionality and increasing cable work uniformity. The present invention includes a tube-like hollow core member 3a that can be pulled out and an elastic tube-like member 3b expanded on an outer circumferential side of the core member 3a, the core member 3a being pulled out in a state in which a power cable has been passed through an inner side of the elastic tube-like member 3b, thereby allowing the elastic tube-like member 3b to constrict and cover the power cable. The elastic tube-like member 3b includes a thick portion 3k arranged along an axis L direction of the core member 3a and capable of covering a border section B of a cable shielding layer 2e and a cable sheath 2g for a power cable 2A; and a normal portion 3r that is contiguous to the thick portion 3k, is arranged along the axis L direction, and has a lower elasticity than the thick portion 3k.

Description

Covering processing tool, power cable connecting structure, power cable connecting structure assembling method and terminal processing method

The present invention relates to a covering processing tool, a power cable connecting structure, a power cable connecting structure assembling method, and a terminal processing method.

Prior art

There are various types of well-known power cable connection structures, such as termination connection parts equipped with a power cable termination portion and a connection portion body (see Patent Document 1). In such a terminating connection part, the connecting portion body includes a terminal, a porcelain sleeve, an insulating compound and a stress cone. One of the conductors of the power cable terminal portion in the proximal end portion of one of the terminals attached to one of the distal end portions of the porcelain sleeve is compressed or collapsed, thereby connecting the terminal and the power cable termination portion. Further, a strip-like machined portion is formed on the stress cone, and the adhesive tape is wound around one of the distal end portions of the cone, the outer circumference of one of the strip-shaped machined portions of the stress cone, and the terminal portion of the power cable One of the cable sheaths is one of the outer circumferences.

Patent document

Japanese Unexamined Patent Application Publication No. 2011-83144

In the termination joint described above, the adhesive tape is wound around the outer circumference of the cable sheath where the strip-like machined portion is provided and functions to increase resistance to strip-like machined portions and cables The frictional force between the wire sheaths, thereby enhancing the cable retention function of the terminating connection parts. However, when the adhesive tape is wound, the adhesive tape must be sufficiently stretched and entangled under high tension to ensure sufficient friction between the strip-like machined portion and the cable sheath. Since it is necessary to wrap around when the adhesive tape is stretched in this way, the operation of winding the adhesive tape takes time and effort. A further problem is that the adhesive tape may be uneven due to a change in the tension of the adhesive tape during the winding operation of the adhesive tape.

The present invention is directed to solving the above-described problems, and an object of the present invention is to provide a cover processing tool, a power cable connection structure, and a power cable connection structure assembly method capable of enhancing a cable holding function while increasing a connection operation uniformity. And terminal processing methods.

A covering processing tool according to a first embodiment of the present invention is a covering processing tool comprising a pullable tubular shaped hollow diameter expansion holding member and held in an expanded state in the expanded diameter retaining member An elastic-like tubular member on an outer peripheral side, the elastic-like tubular member is contracted by pulling down the diameter-expanding holding member in a state in which the power cable has passed through the inner side of the diameter-expanding holding member, and by the A constricted elastic-like tubular member covers the power cable, wherein the elastic-like tubular member includes an axial direction disposed along one of the diameter-expandable retaining members and capable of covering a cable shield and a cable between the power cable a first zone of a boundary section between the jackets a segment, and a second segment adjacent to the first segment, the second segment being disposed along an axial direction of the diameter expansion holding member, and the second segment having a lower portion than the first segment elasticity.

According to this embodiment, when the tubular-like hollow-diameter expansion-holding member is pulled down in a state where the power cable has passed through the diameter-expanding holding member, the elasticity is retained on the outer peripheral side of the diameter-expanding holding member in an expanded state. The tubular-like member will be tightened such that the tight, elastic-like tubular member covers the power cable. In a cover treatment tool, the elastic-like tubular member includes the first section, the first section being more resistant to deformation than the second section. The first section is disposed along an axial direction of the diameter expansion retaining member and is capable of covering the boundary portion of the cable shield of the power cable and the cable jacket. When the resilient tubular member is tightened, the first section will span the boundary section of the power cable to properly position it. As a result, the cable sheath is prevented from moving in the longitudinal direction of the power cable.

In a cover processing tool according to another embodiment, the first section may be a thicker portion thicker than the surrounding portion.

In a covering processing tool according to another embodiment, the covering processing tool may further include a waterproof member held between the diameter expansion holding member and the elastic tubular member, wherein one of the waterproof members is positioned relative to the The first section is offset in an axial direction of one of the diameter expansion retaining members.

In a covering treatment tool according to another embodiment, an electric field reducing portion that is held between or integrated with the elastic expansion tubular member and the elastic tubular member is provided.

A power cable connection structure according to a first embodiment of the present invention is provided with an elastic-like tubular member covering a power cable, the power cable being processed such that a cable shielding layer and a cable sheath are as stated The power cable connection structure also includes a first segment formed by the elastic tubular member, disposed along a longitudinal direction of the power cable and capable of covering the cable a boundary portion of the shielding layer and the cable jacket; and a second portion adjacent to the first portion, disposed along the longitudinal direction of the power cable and having a lower elasticity than the first portion Flexibility.

In the embodiments described above, the cable shielding layer and the cable jacket are exposed from the terminating end side in the stated sequence, and thus the length of the cable shielding layer in the radial direction and the cable guard The length of the sleeve in the radial direction will be different. Therefore, a step will be formed at the boundary portion of the cable shielding layer and the cable sheath, and this step may cause a problem because the power cable is covered by the elastic tubular member. At the time of the line, the portion of the elastic tubular member positioned above the boundary portion is easily stretched. However, in the power cable connection structure described above, the first section of the elastic-like tubular member is disposed along the longitudinal direction of the power cable and is capable of covering the boundary section, and the first section is Resistance to deformation of the elastically-like tubular member positioned at the boundary section, and thus preventing the problems described above from occurring.

In a power cable connection structure according to another embodiment, the first section and the second section may be formed by a single elastic tubular member.

In a power cable connection structure according to another embodiment, at least the first section may be formed by a plurality of elastic-like tubular members.

A power cable connection structure according to another embodiment may further include a waterproof member disposed on the cable jacket.

In a power cable connection structure according to another embodiment, the waterproof member may be positioned at a fixed distance toward a proximal end side of the power cable compared to the boundary section, and the waterproof member A position may be longitudinally offset from one of the power cables relative to the first section.

A power cable connection structure assembly method according to a first embodiment of the present invention is a connection structure assembly method for covering a power cable using a cover processing tool, the cover processing tool comprising a pullable tubular hollow a diameter expansion holding member, and an elastic-like tubular member held on an outer peripheral side of one of the diameter expansion holding members in an expanded state, the power cable connection structure assembling method comprising: processing the power cable to shield the cable a step of exposing the layer and the cable sheath from one end side in the stated sequence; mounting the diameter expansion retaining member on the power cable to cover between the cable shield and the cable jacket a step of one of the boundary segments; and tightening the elastic-like tubular member by pulling out the diameter-expanding retaining member to cover the power cable with the compact elastic-like tubular member and forming one along the power cable Positioning in a longitudinal direction and capable of covering a first section of a boundary section between the cable shielding layer and the cable jacket, and adjoining to the first section One positioned in the longitudinal direction of the power cable and the resilient elasticity of the first section is less than one, one step of the second section.

According to this embodiment, when the tubular-like hollow-diameter expansion-holding member is pulled down in a state where the power cable has passed through the diameter-expanding holding member, the elasticity is retained on the outer peripheral side of the diameter-expanding holding member in an expanded state. Tubular components will tighten The tightening elastic-like tubular member covers the power cable. The resilient tubular member covers the power cable thereby forming a first section that is more resistant to deformation than the second section. The first section is disposed along an axial direction of the diameter expansion retaining member and covers the boundary portion of the cable shield of the power cable and the cable jacket. When the elastically-like tubular member contracts, the first section will span the boundary section of the power cable to properly securely position it. As a result, the cable sheath is prevented from moving in the longitudinal direction of the power cable. Furthermore, since the first section is disposed along the axial direction of the diameter expansion retaining member and is capable of covering a boundary section of the cable shielding layer and the cable sheath, the elasticity is positioned at the boundary section A tubular-like member resists deformation.

A terminal processing method according to an embodiment of the present invention is a terminal processing method for covering a second elastic-like tubular member in a power cable connection structure, the power cable connection structure including covering a power cable One of the first elastic-like tubular members is processed such that a cable shielding layer and a cable sheath are exposed from the one end side in the stated order, and the terminal processing method includes: expanding and expanding the diameter a step of mounting a member on the first elastically-like tubular member to cover a position corresponding to a boundary portion of the cable shielding layer and the cable sheath by using a covering processing tool, the covering process The tool includes a tubular elastic hollow expansion retaining member and a second elastic tubular member held on an outer peripheral side of one of the diameter expansion retaining members in an expanded state; by pulling the diameter expansion retaining member Step of tightening the second elastic-like tubular member to cover the power cable with the second elastic-like tubular member via the first elastic-like tubular member ; Wherein, in the covering step, like the first elastic tubular member and the second elastic tubular member is formed like disposed in the longitudinal direction of the power cable and one A first section of one of the boundary portions of the cable shielding layer and the cable sheath can be covered, and any one of the first elastic-like tubular member or the second elastic-like tubular member is formed to be adjacent to the first portion A second section of one of the sections, the second section being disposed along a longitudinal direction of the power cable, and the second section having a lower elasticity than the first section.

According to this embodiment, when the power-like cable covered by the first elastic-like tubular member has been pulled out of the diameter-expanding holding member, the tubular-shaped hollow-diameter expansion-holding member is pulled down in an expanded state. The second elastic-like tubular member on the outer peripheral side of the diameter expansion holding member may contract to cover the power cable via a first elastic-like tubular member. The second resilient tubular member also covers the power cable, forming a first section that is more resistant to deformation than the second section. The first section is disposed along an axial direction of the diameter expansion holding member and covers the cable shielding layer of the power cable and the cable sheath with the first elastic-like tubular member and the second elastic-like tubular member The boundary section, and when the second elastically-like tubular member contracts, the first section will span the boundary section of the power cable to properly securely position it. As a result, the cable sheath is prevented from moving in the longitudinal direction of the power cable. Furthermore, since the first section is disposed along the axial direction of the diameter expansion retaining member and is capable of covering a boundary section of the cable shielding layer and the cable sheath, the elasticity is positioned at the boundary section A tubular-like member resists deformation. Further, the cover processing tool can be reused on the installed power cable connection structure to suppress the collapse phenomenon.

A terminal processing method according to a first embodiment of the present invention is a terminal processing method for further covering a second elastic-like tubular member in a power cable connection structure, the power cable connection structure including a cover One of the first cables of the power cable Similar to the tubular member, the power cable is processed such that a cable shielding layer and a cable sheath are exposed from the one end end side in this order, and the terminal processing method includes: mounting the diameter expansion holding member The first elastic-like step on the tubular member to cover a position corresponding to one of the boundary portions between the cable shielding layer and the cable sheath by using a covering processing tool, the covering processing tool And including a tubular-like hollow-diameter expansion-holding member and a second elastic-like tubular member held on an outer peripheral side of one of the diameter-expandable holding members in an expanded state; and by pulling out the diameter-expanding holding member Step of tightening the second elastically-like tubular member and then covering the power cable with the first elastic-like tubular member via the first elastic-like tubular member, wherein in the covering step, the first elasticity is similar The tubular member and the second elastically-like tubular member form one of the boundary sections disposed along a longitudinal direction of the power cable and capable of covering the cable shielding layer and the cable sheath Section.

According to this embodiment, when the power-like cable covered by the first elastic-like tubular member has been pulled out of the diameter-expanding holding member, the tubular-shaped hollow-diameter expansion-holding member is pulled down in an expanded state. The second elastic-like tubular member on the outer peripheral side of the diameter expansion holding member may contract to cover the power cable via a first elastic-like tubular member. The first elastic-like tubular member and the second elastic-like tubular member are disposed along an axial direction of the diameter expansion holding member and cover the boundary between the cable shielding layer of the power cable and the cable sheath Section. When the second elastically-like tubular member contracts, the first elastic-like tubular member and the second elastic-like tubular member will press the boundary portion of the power cable to properly position it. As a result, the cable sheath is prevented from moving toward The power cable moves in the longitudinal direction. Further, the cover processing tool can be reused on the installed power cable connection structure to suppress the collapse phenomenon.

According to this aspect of the invention, it is possible to provide a cover processing tool, a power cable connection structure, a power cable connection structure assembly method, and a terminal processing method capable of enhancing a cable holding function and increasing a cable connection work uniformity.

1‧‧‧ Connection structure

2‧‧‧Power cable termination structure

2A‧‧‧Power cable

2a‧‧‧ Terminal

2b‧‧‧conductor

2c‧‧‧Insulator

2d‧‧‧Semiconductor layer

2e‧‧‧ cable shield

2g‧‧‧ cable jacket

2h‧‧‧tinned annealed copper wire

2j‧‧‧Grounding wire

3‧‧‧Overlay processing tools

3A‧‧‧Overlay Processing Tools

3Aa‧‧‧ core components

3Ab‧‧‧First elastic-like tubular member

3B‧‧‧Overlay Processing Tools

3Bb‧‧‧Second elastic tubular member

3a‧‧‧ core member (diameter expansion holding member)

3b‧‧‧Flexible tubular members

3d‧‧‧Continuous spiral groove

3e‧‧‧core ribbon

3f‧‧‧ first end

3g‧‧‧second end

3h‧‧‧Exposed part

3j‧‧‧Exposed part

3k‧‧‧thick section (first section)

3m‧‧‧ proximal section

3r‧‧‧ normal part (second section)

3s‧‧‧Waterproof member (first waterproof member)

3t‧‧‧Second waterproof member

3u‧‧‧ electric field mitigation part

3x‧‧‧ first surface

3y‧‧‧second surface

3z‧‧‧ third surface

4‧‧‧ Positioning belt

4A‧‧‧Terminal section (terminated section)

5‧‧‧ Conductive ground wire extraction body

6‧‧‧Multi-core bracket

13k‧‧‧thick section

23k‧‧‧high hardness rubber

33k‧‧‧insulated wire

34‧‧‧First waterproof member

36‧‧‧Electric field mitigation components

40A‧‧‧First Section

40B‧‧‧Second section

43k‧‧‧ ribs

B‧‧‧Boundary section

D1‧‧‧ distance

D2‧‧‧ distance

D3‧‧‧ length

D4‧‧‧ length

D5‧‧‧ distance

F‧‧‧terminal hole depth

L‧‧‧ axis

1 is a view schematically illustrating a power cable connection structure according to an embodiment of the present invention.

2 is a diagram illustrating the overlay processing tool in accordance with an embodiment of the present invention.

Figure 3 is a diagram illustrating the state in which the overlay processing tool has been mounted on the power cable.

4 is a view for explaining a cover processing method for covering a terminating end of a power cable using a cover processing tool.

5 is a view for explaining a cover processing method for covering the terminating end of a power cable using a cover processing tool.

6 is a view for explaining a cover processing method for covering the terminating end of a power cable using a cover processing tool.

7 is a view for explaining a cover processing method for covering the terminating end of a power cable using a cover processing tool.

Fig. 8 is a view illustrating a modified example of a first section.

Fig. 9 is a view for explaining a terminal processing method according to a modified example.

Fig. 10 is a view for explaining a state in which a cover processing tool according to a modified example has been mounted on the power cable.

Fig. 11 is a view for explaining a state in which a cover processing tool according to a modified example has been mounted on the power cable.

Embodiments of the present invention will now be described with reference to the drawings.

1 is a view schematically illustrating a connection structure 1 of one of the power cables 2A according to an embodiment of the present invention. 2 is a diagram illustrating the overlay processing tool 3 in accordance with an embodiment of the present invention. Fig. 3 is a view for explaining a state in which the covering processing tool 3 has been mounted on the power cable 2A of Fig. 2. In Figs. 1 to 3, a portion of the elastic-like tubular member 3b (to the left of the shaft L) has been peeled off to expose the inside of the elastic-like tubular member 3b covering the treatment tool 3. For example, the power cable 2A shown in FIG. 1 is used to connect a power supply of a large composite building or other building to an external power supply utility pole. The connection structure 1 of the power cable 2A is provided in the power supply room or on the power supply utility pole.

Hereinafter, a portion to which the terminal of the power cable 2A is attached is referred to as a terminating connection portion. Further, in the embodiment, the term "power cable" is also used to mean "cable line". Further, hereinafter, a portion covered by the elastic-like tubular member 3b of the power cable 2A and a portion where the terminal 2a is provided are sometimes referred to as a power cable termination structure 2, and an upper side of one of the drawings of FIG. 1 ( The terminal 2a side is referred to as a one-end side, and the lower side of FIG. 1 (the opposite side of the terminal 2a) is referred to as a proximal side.

The overlay processing tool 3 can be used in both indoor and outdoor applications, but the embodiments of the invention are described with reference to the drawings for indoor use. As shown in FIG. 2, the overlay processing tool 3 It is used to implement a cover process on the power cable termination structure 2 to protect the power cable termination structure 2. The covering treatment tool 3 is configured to include a core member (diameter expansion holding member) 3a (which can be pulled out and formed into a tube shape), and an elastic-like tubular member 3b (which is held in the expanded state in the core member 3a) On the outer circumference, a waterproof member 3s, a second waterproof member 3t, and an electric field reducing portion 3u.

The core member 3a is a cylindrical tubular hollow member having a detachment line formed on a wall surface along its entire length. The detaching line is provided to advance progressively toward the axis L of the core member 3a while winding around the axis L in one direction, or winding around the axis L in this direction and then reversing. In the embodiment of the invention, a continuous spiral groove 3d is provided. The continuous spiral groove 3d is formed to gradually advance in the direction of the axis L (the axial direction of the diameter expansion holding member) while winding around the axis L of the core member 3a. Hereinafter, the "opening line" is described as a continuous spiral groove 3d. For the material of the core member 3a, a resin such as polyethylene or polypropylene is used. A core strip 3e can be pulled out, and the core strip 3e is a cord-like body that extends along the continuous spiral groove 3d of the core member 3a. The portion where the continuous spiral groove 3d is formed is thinner than the area around the continuous spiral groove 3d, and thus is easily broken. It is to be noted that the detaching line is not limited to the type of spiral form exemplified by the continuous spiral groove 3d and may take the form of S or Z, or any other form that allows drawing.

Therefore, when the core strip 3e is pulled, the core member 3a is progressively broken at a portion of the continuous spiral groove 3d and continuously pulled out as a new core strip 3e. Since the continuous spiral groove 3d is formed at a fixed pitch, the core strip 3e that is pulled out has a uniform width. However, please note that the core strip does not necessarily have a uniform width. The continuous spiral groove 3d may be formed only on the inner circumferential surface of the core member 3a, or may be formed only on the outer circumferential surface, or may be simultaneously formed at On the inner peripheral surface and the outer peripheral surface. For example, in order to manufacture the core member 3a having the continuous spiral groove 3d, when the core strip 3e is wound into a spiral shape, some combination of these methods may be used to adhere, weld or link or join adjacent core strips. Item 3. Alternatively, the continuous spiral groove 3d may be formed directly on a cylindrical member. The pull-out hollow tubular diameter expansion holding member may be of the type described above, whereby the diameter expansion holding member has a strip form and is detached in such a manner that the tubular member 3b is progressively squashed, or may be The type of the diameter expansion holding member is removed by pulling out from the elastic tubular member and by sliding relative to the elastic tubular member.

The core member 3a includes a first end portion 3f (which is at the end where the core strip 3e is initially pulled out) and a second end portion 3g (which forms one end of the end of the core strip 3e) The terminal side). In the vicinity of the first end portion 3f, an exposed portion 3h is formed at the unwrap elastic-like tubular member 3b and at the outer peripheral surface of the exposed core member 3a, and in the vicinity of the second end portion 3g, an exposed portion 3j is formed in the future. It is wound around the tubular member 3b and is exposed at the outer peripheral side of the core member 3a.

The core strip 3 detached from the first end portion 3f passes through the inside of the core member 3a and is pulled from the second end portion 3g. When the core strip 3e is pulled on the side of the second end portion 3g, the core member 3a is gradually disassembled from the first end portion 3f and moved toward the second end portion 3g. In the embodiment of the invention, the continuous spiral groove 3d is formed over the entire length of the core member 3a and thus the core member 3a is detachable over the entire length between the first end portion 3f and the second end portion 3g. Note, however, that it is sufficient to form a continuous spiral groove at least at a portion where the core member 3a of the elastic-like tubular member 3b is held in an expanded state. For example, a portion of the predetermined range of one of the second end portions 3g may not be formed with a spiral groove.

The elastic-like tubular member 3b is held in an expanded state on the outer circumference of the core member 3a and forms an outer cover covering the power cable termination structure 2. The elastic-like tubular member 3b is a room temperature shrinkage tube formed of rubber which shrinks at room temperature and has excellent elastic properties. For the material of the elastic tubular member 3b, an ethylene propylene rubber, a polyoxyethylene rubber or the like can be used. The elastic-like tubular member 3b is held on the core member 3A in an expanded state, but when the core strip 3e of the core member 3a is pulled out, and the core member 3a is gradually disassembled, at the disassembled portion by the core member 3a The support provided will gradually disappear. The diameter of the elastic-like tubular member 3b in the corresponding portion is contracted and shrunk, thereby covering the power cable termination structure 2.

The elastic-like tubular member 3b has been formed therein with a thick portion (first section) 3k thicker than the surrounding area. The thick portion 3k is provided with a portion for restraining the elastic-like tubular member 3b from being stretched. Here, the elastic-like tubular member 3b is configured by a normal portion (second section) 3r and a thick portion 3k, and the normal portion (second section) 3r has a normal thickness and is disposed to adjoin the thick portion 3k, and The thick portion 3k is thicker than the normal portion 3r. Specifically, the elastic-like tubular member 3b includes a thick portion 3k and a normal portion 3r, and the thick portion 3k is disposed along one of the axis L directions of the core member 3a and is capable of covering a cable shield 2e of a power cable 2A and a cable guard One of the 2g boundary sections B (see Fig. 1) is set, and the normal portion 3r adjacent to the thick portion 3k is disposed in the direction of the axis L and is elastic lower than the elasticity of the thick portion 3k.

The length of the thick portion 3k in the L direction is sufficient to cover the length of the boundary section B. Specifically, the length in the axis L direction of the thick portion 3k is set to be sufficiently long, so even if the elastic-like tubular member 3b is displaced in the direction of the axis L with respect to the power cable 2A, the thick portion 3k is positioned outside the boundary portion B in diameter. On the side. Further, the thick portion 3k extends toward a circumference of an elastic-like tubular member 3b at a portion halfway along the direction of the axis L of the elastic-like tubular member 3b, and And formed to surround the elastic-like tubular member 3b in the circumferential direction. The thick portion 3k has a rectangular form when viewed along a section of the axis L of the elastic tubular member 3b. Further, the thick portion 3k includes a first surface 3x and a second surface 3y (which extend in a flat form perpendicular to the plane of the axis L) and a first portion between the first surface 3x and the second surface 3y The three surfaces 3z (which extend in the direction of the axis L and the circumferential direction of the elastic tubular member 3b).

The first waterproof member 3s and the second waterproof member 3t are held between the core member 3a and the elastic tubular member 3b. For example, the first waterproof member 3s and the second waterproof member 3t are filled with putty between the core member 3a and the elastic tubular member 3b. The first waterproof member 3s and the second waterproof member 3t are provided to prevent water from penetrating into the power cable 2A. As the material of the first waterproof member 3s and the second waterproof member 3t, a polyoxyethylene rubber compound, a butyl rubber compound or the like can be used.

In addition to the putty, a rubber-like molded product or a waterproof tape may be used for the first waterproof member. When the cable connection structure is assembled, it may be separately applied as the first waterproof member.

The electric field mitigation portion 3u is held between the core member 3a and the elastic-like tubular member 3b. For example, the electric field mitigation portion 3u is filled with putty between the core member 3a and the elastic-like tubular member 3b, and is provided to weaken electric field concentration and reduce a potential gradient in the power cable 2A. As the material of the electric field lightening portion 3u, for example, epichlorohydrin rubber, nitrile rubber or the like can be used.

The first waterproof member 3s and the second waterproof member 3t and the electric field reducing portion 3u each extend in the circumferential direction of the elastic-like tubular member 3b so as to surround the core member 3a. The portion in which the first waterproof member 3s and the second waterproof member 3t and the electric field mitigating portion 3u are held in the elastic-like tubular member 3b is attributed to the first waterproof member 3s and the second waterproof member 3t and the electric field mitigation portion. There is a 3u presence and a convex curved form. The first waterproof member 3s is positioned closer to the proximal end side of the elastic-like tubular member than the thick portion 3k. The second waterproof member 3t and the electric field mitigating portion 3u are positioned closer to the terminating end side than the thick portion 3k, and the second waterproof member 3t is positioned closer to the terminating end side than the electric field mitigating portion 3u. Therefore, the position of the first waterproof member 3s, the position of the thick portion 3k which is elastic like the tubular member 3b, the position of the electric field reducing portion 3u, and the position of the second waterproof member 3t are in the direction of the axis L (the longitudinal direction of the power cable 2A) Staggered.

In addition to being putty, the electric field mitigating portion may be formed as an integral body or a body separate from the elastic-like tubular member from the elastic-like tubular member, or may be formed by combining putty and elastic-like tubular members. In addition, the electric field mitigating portion can be formed by mitigating the strip or sheet by an electric field with a layer of putty on one side.

The power cable termination structure 2 processed using the overlay processing tool 3 is described below. Here, the power cable terminating structure 2 is referred to as having a structure of a terminal 2a, and the terminal is connected to a conductor 2b by compression, contraction or the like on the terminating end side of the power cable 2A. As shown in FIG. 1, the power cable 2A is provided with a conductor 2b, an insulator 2c, a semiconductor layer 2d, a cable shielding layer 2e, a cable jacket 2g, and a grounding wire 2j. The insulator 2c is configured to have a portion of an insulating resin and the like, and covers the outer peripheral surface of the insulator 2c.

The semiconductor layer 2d has one layer of semiconductor properties, and can be formed using fibers or paper impregnated with a conductive substance such as carbon or the like. The semiconductor layer 2d is disposed on the inner peripheral side of the cable shielding layer 2e, and has enhanced power by making a portion having a high local electric field (caused by the overlap between the cable shielding layer 2e or the like) uniform. The effect of insulation of cable 2A.

The cable shield 2e is a belt-like layer that is provided to prevent electrical shock and to allow leakage current of the power cable 2A to flow. For example, the cable shield 2e material can be copper, and in this case, the cable shield 2e is also referred to as a shielded copper strip. The cable shielding layer 2e covers the outer periphery of the semiconductor layer 2d. The cable sheath 2g is constructed, for example, of polyvinyl chloride or polyethylene. The cable sheath 2g covers the outer circumference of the cable shielding layer 2e. The cable sheath 2g is fixed to the outer circumference of the cable shielding layer 2e without using an adhesive or the like, and thus the cable shielding layer 2e is movable relative to the cable sheath 2g in the direction of the axis L.

Before covering the power cable termination structure 2 with the cover processing tool 3, the insulator 2c, the semiconductor layer 2d, the cable shielding layer 2e, and the cable sheath 2g are stripped to sequentially terminate the end-side exposed conductor 2b, the insulator 2c, semiconductor layer 2d and cable shielding layer 2e. Further, on the outer peripheral surface of the exposed cable shield 2e, a conductive ground wire extraction body 5 is attached. The ground line extraction body 5 is connected to the ground line 2j, and the ground line 2j extends to the proximal end side of the power cable 2A.

It is worth noting that the configuration of the power cable termination structure 2 described above is an example of a terminating connection location, and other configurations may be used. For example, a paper-like adhesive tape can be wound around the outer circumference of the cable shielding layer 2e. Alternatively, an inner semiconductor layer may be disposed on the outer circumference of the conductor 2b to cover the outer circumference of the conductor 2b. When the inner semiconducting layer is placed on the outer circumference of the conductor 2b in this manner, the electric field locally concentrated in the outer peripheral region of the conductor 2b can be stabilized, which contributes to uniform electric field.

As shown in FIG. 3, when the power cable termination structure 2 is covered with the cover processing tool 3, the cover processing tool 3 is mounted on the power cable termination structure 2, and the first waterproof member 3s is oriented to face The proximal end side of the power cable 2A, and the second waterproof member 3t It is oriented toward the terminating end side of the power cable 2A. The processing tool 3 is positioned relative to the power cable 2A such that the proximal section 3m of the elastic-like tubular member 3b positioned at the proximal end side of the covering processing tool 3 is overlaid on the cable sheath 2g One of the positioning straps 4 terminates the section 4A (see Figure 6(b)).

The positioning belt 4 is used to be able to identify the individual power cables 2A of the plurality of power cables 2A, and for example, the colors of the respective power cables 2A may be different. Note that the position of the positioning belt 4 is not limited to the examples described above, and may be appropriately determined for each type of power cable. When the core member 3a is pulled out after fixing the position of the covering processing tool in the manner described above, the diameter of the elastic-like tubular member 3b is contracted and shrunk and tightly attached to the power cable 2A, followed by the elastic-like tubular member 3b covers the power cable 2A, thereby completing the connection structure 1.

Here, as shown in FIG. 1 and FIG. 3, in the connection structure 1 of the power cable 2A, the thick portion 3k of the elastic-like tubular member 3b is covered by the cable shielding layer 2e and the cable sheath 2g. Boundary section B between. The first waterproof member 3s is positioned closer to the proximal side than the boundary section B, and a distance D1 from the boundary section B to one of the terminating end sections of the first waterproof member 3s is, for example, 20 mm. The thick portion 3k covers the proximal end side of the cable shielding layer 2e and the grounding wire extraction body 5. A distance D2 from the boundary section B to the terminating end section of the thick portion 3k is, for example, 20 mm, and a length D3 of the terminating end section from the boundary section B to the cable shielding layer 2e in the direction of the axis L is, for example, It is 30mm.

The electric field mitigating portion 3u covers one portion of the proximal end side of the semiconductor layer 2d and the insulator 2c, and the length D4 from the boundary portion B to the semiconductor layer 2d in the direction of the axis L is, for example, 10 mm. The second waterproof member 3t covers a portion of the terminating end side of the insulator 2c, and the conductor 2b And a part of the proximal side of the terminal 2a. One of the distances D5 from the boundary section B to the terminating end section of the insulator 2c is, for example, at least 130 mm. It is worth noting that the distances D1, D2 and D5 and the lengths D3 and D4 described above can be appropriately changed depending on the type of power cable. However, it should be noted that if a waterproof member is positioned near the boundary portion B, application of heat or the like may result in a decrease in the viscosity of the waterproof member, resulting in movement of the cable sheath relative to the cable shield. For this reason, the first waterproof member 3s must be separated from the boundary section B by a fixed distance, and thus the distance D1 is preferably set to be at least 20 mm.

Next, an assembling method for the connection structure 1 for covering the power cable 2A of the power cable 2A using the above-described overlay processing tool 3 will be described with reference to FIGS. 4 to 7. In the following, the operation of the stage before covering the power cable 2A in the power cable termination structure 2 is also described. Furthermore, although an example in which the power cable 2A is a three-core (3-strand) cable (as shown in FIGS. 4(a) and 7(d)) is described below, the assembly method of the embodiment of the present invention is also It can be applied to cables other than three-core cables.

First, as shown in FIG. 4(a), a plurality of power cables 2A are fixed by a multi-core bracket 6 to be closer to the proximal side than the terminating end, and for example, a power cable The termination of 2A is cut, and the power cable termination structure 2 is formed such that the termination ends are aligned along a single line. As shown in FIG. 4(b), the terminal hole depth F is measured for the terminal 2a attached to the power cable 2A.

As shown in Fig. 4 (c), the cable shielding layer 2e is exposed by peeling only one of the predetermined lengths of the cable sheath 2g. Here, the predetermined length described above is determined based on the nominal conductor cross-sectional area, the terminal type, and the terminal hole depth F. As shown in FIG. 4(d), a tinned annealed copper wire 2h is attached at a predetermined position, and the cable is cut along the tinned annealed copper wire. The shield layer 2e exposes the semiconductor layer 2d, and the termination insulator side 2c of the semiconductor layer 2d is also removed.

As shown in Fig. 5 (a), the terminal 2 side of the insulator 2c is stripped of the exposed conductor 2b. At this point, the dimension of the stripped insulator 2c in the longitudinal direction is determined based on the nominal conductor cross-sectional area, the terminal type, and the terminal hole depth F. As shown in FIG. 5(b), a cable sheath extending from the slit (boundary section B) in the cable sheath 2g to a range of about 300 mm on the proximal side is used using a cable cleaning material or the like. 2g wipe clean.

As shown in FIG. 5(c), the position is about 40 mm away from the boundary section B of the cable sheath 2g and the cable shielding layer 2e to the position of the cable sheath 2g side (proximal side). Positioning belt 4. Here, different color positioning belts 4 are used for each of the power cables 2A so that the power cable 2 can be identified.

Since the position covered by the elastic-like tubular member 3b is determined in accordance with the position of the winding positioning belt 4, the operation of winding the positioning belt 4 must be performed accurately. Next, as shown in Fig. 5 (d), the ground wire extraction body 5 is fixed at a position where the winding cable shielding layer 2e is located as close as possible to the cable sheath 2g. At this time, the grounding wire 2j is installed to contact the grounding wire extraction body 5 and extend from the grounding wire extraction body 5 to the proximal end side.

As shown in Fig. 6(a), the surface of the insulator 2c is wiped clean using a cable cleaning material or the like. At this point, it is preferable to wipe the insulator 2c by moving a cable cleaning material or the like from the semiconductor layer 2d side (proximal side) to the conductor 2b side (terminal end side). Next, as shown in FIG. 6(a), the cover processing tool 3 is mounted on the power cable 2A. At this time, the direction in which the core strip 3e is pulled out is oriented toward the side of the conductor 2b (terminal end side) . Next, the covering treatment tool 3 is positioned relative to the positioning belt 4 such that the proximal end section 3m of the elastic-like tubular member 3b overlies the terminating end section 4A of the positioning belt 4.

Next, the core strip 3e is pulled out from the end end side to gradually disassemble the core member 3a from the first end portion 3f. Note that the mark or the like for aligning the first end portion 3f and the second end portion 3g of the core member 3a can be applied to the power before and after the operation of the winding positioning belt 4 shown in Fig. 5(c) Cable 2A. In this case, an additional mark or the like can make the alignment operation shown in Fig. 6(a) significantly easier.

As shown in Fig. 7(a), the core member 3a is progressively disassembled from the first end portion 3f as the core strip 3e is pulled out at the end end side, and is self-proximal from the elastic like tubular member 3b. The side gradually covers the power cable 2A. Please note that the core strip is completely pulled out. Next, as shown in FIG. 7(b), the terminal 2a is attached to the conductor 2b using a predetermined tool. Thereafter, as shown in Fig. 7 (c), a polyethylene tape 7 is wound around the proximal end side of the terminal 2a, the conductor 2b, and the end side of the elastic-like tubular member 3b. Next, if the grounding is necessary, grounding is performed, thereby completing the assembling operation of the connection structure 1 of the power cable 2A as shown in Fig. 7(d).

Next, the effects of the method of assembling the connection structure 1 of the cover processing tool 3, the power cable 2A, and the connection structure 1 of the power cable 2A according to the embodiment of the present invention will be described.

With the conventional power cable connection structure, the cable sheath shrinks due to internal pressure during cable manufacturing, especially if the cable has been installed outdoors for a long time. Since the cable sheath shrinks in this manner, a collapse phenomenon occurs, thereby exposing the cable shielding layer. When the collapse phenomenon occurs, the water can easily penetrate into the cable and there is a risk of problems such as insulation failure.

With the covering treatment tool 3 of the embodiment of the invention, the elastic-like tubular member 3b includes a thick portion 3k which is more resistant to deformation than the peripheral portion (normal portion 3r), and when the elastic-like tubular member 3b contracts, the thick portion 3k The boundary section B of the power cable 2A is tightly fastened. As a result, the cable sheath 2g is prevented from moving in the longitudinal direction of the power cable 2A. Further, first and second waterproof members 3s and 3t are provided between the core member 3a and the elastic tubular member 3b. The first waterproof member 3s and the second waterproof member 3t are disposed at positions displaced in the direction of the axis L with respect to the thick portion 3k.

For the waterproof member of the first waterproof member 3s and the second waterproof member 3t, it is common practice to use a putty-like substance having fluidity. However, the use of smooth materials such as putty materials and the like to combat sacral retraction is not a common practice. Conventionally, a measure against pyknosis is to wind a belt with a waterproof property around the diameter of the cable.

On the other hand, in the embodiment of the present invention, the cable sheath 2g is prevented from moving by being able to cover the thick portion (first section) 3k of the boundary section B, and is in the core member (diameter expansion holding member) 3a and The first waterproof member 3s and the second waterproof member 3t are provided between the elastically-like tubular members 3b at positions shifted from the thick portion 3k in the direction of the axis L. Therefore, the use of the first waterproof member 3s and the second waterproof member 3t which are the putty substances having the flowability can be carried out as a measure against the contraction.

Further, from the viewpoint of the efficiency of filling the gap, it is preferable to fill the gap system with the putty substance in the embodiment as compared with the winding belt. Please also note that in the embodiment of the present invention, the first waterproof member 3s and the second waterproof member 3t formed of the putty substance are provided. It is inside the elastic-like tubular member 3b, not on the outer diameter side, and thus the waterproof performance can be greatly increased.

Furthermore, with the conventional processing method of inserting a cable into a stress cone, the outer diameter of the cable and the inner diameter of the stress cone are approximately the same. Therefore, the termination structure is assembled by inserting the cable into the stress cone. In processing methods such as the use of inserts, grease (lubricant) is applied to the inner circumference of the normal stress cone to make it easier to insert the cable, and the tip of the stress cone covers the boundary section of the cable to ensure a waterproof design Structure. With this type of plug-in type termination structure, the grease is discharged outward when the cable is inserted, and if the discharged grease is not removed in an appropriate manner, problems such as a decrease in attachment force are caused. In contrast, with the power cable termination structure 2 of the embodiment of the present invention, when the thick portion 3k spans the pressure boundary section B, it directly covers the boundary section B. Therefore, the power cable termination structure 2 is more effective than the prior art in suppressing collapse and retraction. In addition, the problem of the type described above does not occur because there is no need to remove the grease.

In addition, since the waterproofing by the first waterproof member 3s and the second waterproof member 3t and the holding by the thick portion 3k are independently performed, the waterproof and retaining function of the power cable 2A can be enhanced. Therefore, since the cable sheath 2g is strongly pressed by the thick portion 3k, it is possible to avoid the case where the internal pressure introduced during the manufacture of the power cable 2 causes the cable sheath 2g to contract. Therefore, the situation in which the cable shielding layer 2e is exposed can be avoided and the above-described collapse phenomenon can also be suppressed.

Further, with the cover processing tool 3, the thick portion 3k and the first waterproof member 3s and the second waterproof member 3t are provided, and thus it is not necessary to provide a belt for increasing the waterproofing and holding of the power cable 2A, and it is easy to disassemble Core member 3a to cover power cable 2A. Therefore, the uniformity of the operation associated with covering the power cable 2A can be improved. Further, since the thick portion 3k and the first waterproof member 3s and the second waterproof member 3t are provided in advance at a predetermined position of the covering processing tool 3, the risk of the operator installing the waterproof member at an undesired position is eliminated, and the improvement can be remarkably improved. Operational.

With the cover processing tool 3, the first section which is more resistant to deformation than the surrounding (normal portion 3r) is provided by the thick portion 3k, and thus the thick portion 3k is appropriately extended toward the terminal 2a side (terminated end side) and The semiconductor layer is incorporated in the thick portion 3k to form a stress cone integrated with the thick portion 3k, and the thick portion 3k can be further provided with an electric field mitigating function.

The putty-like electric field mitigating portion 3u held between the core member 3a and the elastic-like tubular member 3b is provided on the opposite side of the core member 3a in the direction of the axis L, and the thick portion 3k is at the electric field mitigating portion 3u and the first waterproof member 3s between. Note that one way of providing the electric field mitigating portion on the opposite side of the core member 3a in the direction of the axis L and interposing the thick portion 3k between the electric field mitigating portion 3u and the first waterproof member 3s is by the thick portion 3k The semiconductor layer is incorporated to form a stress cone integrated with the elastic-like tubular member 3b, whereby it can exhibit an electric field mitigating function. Therefore, in the embodiment of the invention, the electric field mitigation portion 3u can be provided in advance at a predetermined position of the cover processing tool 3 and thus the risk of the operator installing the electric field mitigation portion at an undesired position can be eliminated, and the operability can be remarkably improved. In addition, compared with the case where the electric field mitigation belt is used (the electric field mitigation belt acts to weaken the electric field), since it is not necessary to wrap around any belt, the work process can be shortened. Therefore, operability can be improved.

In the power cable 2A, the cable shielding layer 2e and the cable sheath 2g are exposed from the terminating end side in the stated order, and thus the diameter direction of the cable shielding layer 2e and the diameter of the cable sheathing portion The direction length is different. Therefore, in the cable shielding layer 2e and cable protection A step is formed at the boundary section B between the sets of 2g. This step can be problematic because when the power cable 2A is covered by an elastic-like tubular member having no thick portion, the portion of the elastic-like tubular member positioned above the boundary portion B is easily stretched. However, in the connection structure 1 of the power cable 2A, the thick portion 3k covers the boundary portion B, so that the elastic-like tubular member positioned at the boundary portion B can be resistant to deformation. As a result, the problem described above does not occur. Further, due to the elastic force of the tubular member 3b, the thick portion 3k tightly holds the boundary portion B, and the power cable 2A can be stably held.

The present invention is not limited to the embodiments described above, and various modifications can be made to the embodiments without departing from the spirit of the invention.

For example, although in the embodiment described above, the thick portion 3k is formed to surround the elastic-like tubular member 3b in the circumferential direction, the thick portion need not be formed to surround the elastic-like tubular member in the circumferential direction, and may instead include A plurality of discrete thick sections. The thick portion 3k has a rectangular form when the cross section of the elastic-like tubular member 3b is examined along the axis L. However, as shown in Fig. 8(a), a thick portion 13k may be used instead of the thick portion 3k, and when the cross section of the elastic-like tubular member 3b is examined along the axis L, the thick portion 13k has a trapezoidal form. Further, the thick portion may be in the form of a curved protrusion or may be changed to another suitable shape.

Furthermore, another cover processing tool can be used to form a thick portion (which is formed as a "first segment"). In this case, after collapsing to cover the boundary section with the first overlay processing tool, a thick portion is formed by crimping another overlay processing tool to cover the first overlay processing tool. This method is described below with reference to FIG.

Next, an assembling method of covering the connection structure of the power cable 2A using two covering processing tools will be described. Processing the power cable 2A so that the cable shielding layer 2e and the cable The step of exposing the sheath 2g from the terminating end side in the stated sequence is identical to the embodiment described above. In this method, the treatment tool 3B is covered with one of a first elastic-like tubular member 3Ab (as shown in Fig. 9(a)) and one of the second elastic-like tubular members 3Bb (e.g. Figure 9 (b)). The length of the first elastic-like tubular member 3Ab is similar to that of the elastic-like tubular member 3b described in the above embodiment. The second elastic-like tubular member 3Bb may be shorter than the first elastic-like tubular member 3Ab as long as it can cover a portion of the region near the boundary section B. The assembly method includes: mounting a core member 3Aa of the first covering processing tool 3A on the power cable 2A to cover the boundary section B of the cable shielding layer 2e and the cable sheath 2g and covering with the first elastic-like tubular member One step of the power cable 2A (please refer to FIG. 9(c)); a core member 3Ba of the second covering treatment tool 3B is mounted on the first elastic-like tubular member 3Ab so as to cover the cable shielding layer 2e and the cable corresponding to the cable One of the positions of one of the boundary sections B of the wire sheath 2g (refer to FIG. 9(d)); and the step of covering the power cable 2A with the second elastic-like tubular member 3Bb via the first elastic-like tubular member 3Ab (See Figure 9(e)). In the step shown in Fig. 9, pulling out the core members 3Aa and 3Ba causes the elastic-like tubular members 3Ab and 3Bb to contract and cover the power cable 2A with the contracted elastic-like tubular members 3Ab and 3Bb. As a result, a first section 40A disposed along the longitudinal direction of the power cable 2A and capable of covering one of the boundary sections B and a second section 40B adjacent to one of the first sections 40A are formed, the second section 40B being along the power cable The line 2A is placed in the longitudinal direction and is less elastic than the first section 40A. In the embodiment of the present invention, the first section 40A is formed by a plurality of (two) elastic-like tubular members on the inner side of the first elastic-like tubular member 3Ab and the second elastic-like tubular member 3Bb on the outer side. . According to the assembling method described above, it is not necessary to prepare a covering treatment tool including a special elastic-like tubular member having a thick portion, and an existing covering treatment tool can be used.

Next, a terminal processing method using the second elastic-like tubular member 3Bb to cover the connection structure in which the power cable 2A has been covered with the first elastic-like tubular member 3Ab is described. The terminal processing method includes a step of mounting a second core member 3Ba on the first elastic-like tubular member 3Ab to cover one of the positions of the boundary portion corresponding to the connection structure already in the state of FIG. 9(c) ( Please refer to FIG. 9(d)); and a step of covering the power cable 2A with the second elastic-like tubular member 3Bb via the first elastic-like tubular member 3Ab (please refer to FIG. 9(e)). In the steps described above, the first elastic-like tubular member 3Ab and the second elastic-like tubular member 3Bb are formed such that the first section 40A disposed along the longitudinal direction of the power cable 2A and capable of covering the boundary section B is formed. The first elastic-like tubular member 3Ab is formed such that the second section 40B that is adjacent to the first section 40A, disposed in the longitudinal direction of the power cable 2A and elastically lower than the elasticity of the first section 40A is formed. According to the terminal processing method described above, the overlay processing tool can be used again on the mounted connection structure of the power cable 2A to suppress the collapse phenomenon.

In the assembly method shown in Fig. 9, the second elastic-like tubular member 3Bb may first be used to cover the boundary section B, and then the first elastic-like tubular member 3Ab may be used to cover above the placement. Alternatively, the first elastic-like tubular member 3Ab and the second elastic-like tubular member 3Bb may be simultaneously held on a single covering treatment tool (in other words, a core member), and may be simultaneously composed of the first elastic-like tubular member 3Ab and the second elastic The tubular member 3Bb is like to cover the power cable 2A. In this case, the second elastic-like tubular member 3Bb may be held on the outer peripheral side of the first elastic-like tubular member 3Ab (which is held on the core member), or may hold the first elastic-like tubular member 3Ab so as to be covered from the outer peripheral side The second elastic-like tubular member 3Bb (which is held on the core member).

In the assembly method shown in Fig. 9, the first elastic-like tubular member 3Ab may first be used to cover the boundary section B, and another first elastic-like tubular member 3Ab may be used to cover the above-described arrangement. For example, if the length of the elastically-like tubular member to be applied is equal to or longer than the length of the elastically-like tubular member to be applied first, it is easy to position and apply the elastic-like tubular member relative to the previously applied elastic-like tubular member. It is no longer necessary to provide a mark (marking is required after applying the elastic-like tubular member because the boundary segment has been covered and cannot be visually confirmed).

If a high dielectric constant material (EPDM, polyoxyethylene rubber or the like) is used as the second elastic-like tubular member disposed on the inner peripheral side of the first elastic-like tubular member, the first section 40A is formed. The second elastically-like tubular member can function as an electric field mitigation member 36.

Specifically, as shown in FIG. 10, an electric field mitigating member 36 formed as a second elastic-like tubular member and also including an electric field mitigating function may be used instead of the putty-like substance as an electric field mitigating portion. Therefore, the electric field mitigation member 36 itself also functions as an elastic tubular member. Accordingly, the electric field mitigation member 36 can be a portion of the constituent elements that extend around the region of the boundary section B and allow to function as the first section 40A. In this case, the first section 40A is formed by a plurality of elastic-like tubular members, that is, an elastic-like tubular member 3b and an electric field-reducing member 36 acting as an elastic-like tubular member. Note that, as shown in FIG. 10, the portion of the elastic-like tubular member 3b corresponding to the first section 40A is formed to be thicker than the surrounding portion. It should also be noted that since the first section 40A is formed by combining the elastic-like tubular member 3b and the electric field reducing member 36, the condition for maintaining the elasticity of the second section 40B lower than that of the first section 40A is premised. Lower, the elastic-like tubular member 3b corresponds to the first The thickness of the section of section 40A may be the same or smaller than the section corresponding to second section 40B. Further, when the first section is formed from a plurality of elastic-like tubular members, the thickness of the "thick portion" is the total thickness of the plurality of elastic-like tubular members.

Further, in the embodiment of the invention, a putty-like substance is used as the waterproof member. However, since the member having the waterproof function is used in the first waterproof member 3s and the second waterproof member 3t, the waterproof member having the cylindrical rubber molded body disposed to cover the boundary section B can be used. When a rubber-like molded body is mounted, a rubber-like molded body may be assembled and then the ground wire extraction body 5 shown in FIG. 5(d) may be assembled, and one end of the rubber-like molded body may be disposed as a boundary region. Segment B is aligned. When a rubber-like molded body is used, a molded body having a predetermined inner diameter, outer diameter, and length can be used, thereby providing reliable waterproofing of the cable to be used, and thus promoting uniformity of the waterproof operation. Further, a rubber-like molded body may be disposed to cover the boundary section B.

An example in which a rubber-like molded body is used as the first waterproof member will be described below with reference to FIG. In this case, the first waterproof member 34 (which itself is a rubber-like molded body) acts as an elastic-like tubular member. Accordingly, the first waterproof member 34 can be disposed adjacent to the boundary section B and allowed to function as a portion of the first section 40A. In a state where the first waterproof member 34 is disposed in the vicinity of the boundary section B, the elastic-like tubular member 3 allows the contraction and covering of the first waterproof member 34 together with the power cable 2A. In this case, the first section 40A is formed by a plurality of elastic-like tubular members, that is, an elastic-like tubular member 3b and a first waterproof member 34 acting as an elastic-like tubular member. In the axial direction of the diameter expansion holding member, the first waterproof member 34 is not displaced relative to the first section. Note that, as shown in FIG. 11, the portion of the elastic-like tubular member 3b corresponding to the first section 40A is formed to have a thick portion, the thick portion being thick The thickness is thicker than the thickness of the surrounding portion. Note also that since the first section 40A is formed by combining the elastic-like tubular member 3b and the first waterproof member 34, under the premise that the elasticity of the second section 40B is maintained lower than the elasticity of the first section 40A The thickness of the section of the elastic-like tubular member 3b corresponding to the first section 40A may be the same as or smaller than the section corresponding to the second section 40B. Further, when the first section is formed from a plurality of elastic-like tubular members, the thickness of the "thick portion" is the total thickness of the plurality of elastic-like tubular members.

As described above, at least the first section 40A can be formed using a plurality of elastic-like tubular members. With this configuration, the elastic-like tubular member provides a retraction-reducing effect and can provide some other functionality (such as waterproof or electric field mitigation). Further, it is also possible to impart a squat back suppression effect to the assembled connection structure.

It should also be noted that when the first section and the second section are formed from a single elastic-like tubular member as shown in FIGS. 1 to 3, the collapse-reducing functionality of the power cable 2A can be provided in a single procedure. . As shown in Figure 11, the waterproof member can form a component of the first section. However, as shown in FIGS. 1 to 3, when the waterproof member 3s is located at a set distance closer to the proximal end side of the power cable 2A than the boundary section B, the waterproof member 3s and the first section are made The position has an advantage in that it is displaced relative to each other in the longitudinal direction of the power cable 2A, and has an advantage in that the positions of the waterproof member 3s and the elastic-like tubular member 3b can be uniformly provided.

In the embodiments described above, the first section (part of the first section) and the second section are separate bodies, but the second section can be configured to use a separate member.

In the embodiment described above, the first section which is more resistant to deformation than the surroundings is formed by the thick portion 3k. However, as shown in Fig. 8(b), for example, the first section can be formed by one of the high-hardness rubbers 23k embedded in the elastic-like tubular member 3b. Further, such as As shown in Fig. 8(c), the first section may be formed by one of the insulated wires 33k embedded in the elastic-like tubular member 3b to extend in the direction of the axis L. In Fig. 8(c), the six insulated wires 33 are embedded so as to be equally spaced in the circumferential direction of the elastic-like tubular member 3b, but the insulated wire 33k can be appropriately changed according to the required strength (tensile resistance) of the first segment. Number of shares and hardness. Further, as shown in Fig. 8(d), a ridge 43k which protrudes from the outer peripheral surface of the elastic tubular member 3b and extends in the direction of the axis L may be provided as the first section.

In the example of the section in which the high-hardness rubber 23k is embedded, the section in which the insulated wire 33k is embedded, and the section in which the ridge 43 is formed, as shown in Figs. 8(b) to 8(d), each section is wider than the circumference. (Normal portion 3r) is more resistant to deformation, and thus the same effect as in the embodiment described above can be achieved. It should also be noted that the first segment can be implemented using configurations other than those described above. As the material of the high hardness rubber 23k, a polyoxyethylene rubber, an ethylene propylene rubber or the like can be used, and as the material of the insulated wire 33k, glass fiber, alumina fiber, carbon fiber or the like can be used.

In the embodiment described above, the core member 3a is used as the detachable tubular hollow diameter expansion holding member, but the structure of the core member 3a can be appropriately modified. The size and form of the core member 3a and the elastic-like tubular member 3b can be appropriately modified according to the type of the power cable. For example, for a cover treatment tool for outdoor use, an elastic-like tubular member provided with a shield can be used. Further, although the core member 3a is detached by pulling the core strip 3e along the continuous spiral groove 3d as a chord-shaped body in the embodiment described above, a diameter-expanding holding member may be used, which may be The elastic tubular member is slid and pulled from the elastic tubular member.

Further, although the cover processing tool 3 includes the electric field mitigation portion 3u in the embodiment described above, the electric field mitigation portion 3u may be omitted, and the high dielectric band may be wound at the portion where the electric field mitigation portion 3u is positioned. For example, after wiping the surface of the insulator 2c, in the range of about 50 mm, from one end of the terminating end side of the grounding wire extraction body 5 to the terminating end from one end portion of the terminating end side of the semiconductor layer 2d The side is wrapped around the high dielectric strip as shown in Figure 6(a). For example, the high dielectric tape is wound to have a 1/2 overlap with a width of 2/3. Please note that if the cable shield 2e has been stripped, the stripped portion will be replaced before the high dielectric tape is wound.

Further, in the embodiment described above, although the thick portion 3k forming the first section to suppress deformation of the elastic-like tubular member 3b is provided, the function and purpose of the first section are not limited to the embodiments described above. Specifically, for example, the first section can be used instead of the stress cone to attenuate the electric field concentration and reduce the potential gradient.

Component symbol

1: connection structure

2: Power cable termination structure

2A: Power cable

2a: terminal

2b: conductor

2c: insulator

2d: semiconductor layer

2e: cable shield

2g: cable jacket

2h: tinned flexible silver wire

2j: Ground wire

3: Overlay processing tool

3a: core member (diameter expansion holding member)

3b: elastic tubular member

3d: continuous spiral groove

3e: core ribbon

3f: first end part

3g: second end part

3h, 3j: exposed part

3k: thick part (first section)

3m: proximal part

3r: normal part

3s: first waterproof member (waterproof member)

3t: second waterproof member

3u: electric field mitigation part

5: Ground wire extraction body

13k: thick part (first section)

23k: high hardness rubber (first section)

33k: insulated wire (first section)

43k: rib (first section)

40A: First section

OB: second section

3‧‧‧Overlay processing tools

3a‧‧‧ core member (diameter expansion holding member)

3b‧‧‧Flexible tubular members

3d‧‧‧Continuous spiral groove

3e‧‧‧core ribbon

3f‧‧‧ first end

3g‧‧‧second end

3h‧‧‧Exposed part

3j‧‧‧Exposed part

3k‧‧‧thick section (first section)

3r‧‧‧ normal part (second section)

3s‧‧‧Waterproof member (first waterproof member)

3t‧‧‧Second waterproof member

3u‧‧‧ electric field mitigation part

3x‧‧‧ first surface

3y‧‧‧second surface

3z‧‧‧ third surface

L‧‧‧ axis

Claims (12)

A covering treatment tool comprising: a tubular-like hollow-diameter expansion-holding member that can be pulled out and an elastic-like tubular member held on an outer peripheral side of one of the diameter-expandable holding members in an expanded state, by an electric power Pulling the diameter expansion retaining member through the one of the inner sides of the one of the diameter expansion holding members to contract the elastic tubular member, and covering the power cable by the tightened elastic-like tubular member, wherein the cable The elastic-like tubular member includes a first section and a second section disposed along an axial direction of the one of the diameter expansion retaining members and capable of covering a cable shielding layer between the one of the power cables a boundary section between the cable sheaths, the second section being adjacent to the first section, disposed along the axial direction of the diameter expansion retaining member and having a lower portion than the first section elasticity. The cover processing tool of claim 1, wherein the first segment is a thick portion that is thicker than the surrounding portion. The covering processing tool of claim 1 or 2, further comprising a waterproof member held between the diameter expansion holding member and the elastic tubular member, wherein one of the waterproof members is positioned relative to the first portion The position is offset in the axial direction of one of the diameter expansion retaining members. A covering treatment tool according to claim 1 or 2, wherein an electric field reducing portion is provided which is held between or integrated with the elastic expansion tubular member and the elastic tubular member. A power cable connection structure comprising an elastic-like tubular member covering a power cable, the power cable being processed such that a cable shielding layer and a cable jacket are exposed from one end side in the stated sequence, The power cable connection structure includes: a first section formed by the elastic tubular member, the first section a boundary section disposed along a longitudinal direction of the power cable and capable of covering the cable shielding layer and the cable sheath; and a second section adjacent to the first section, the second The section is disposed along the longitudinal direction of the power cable and has a lower elasticity than the first section. The power cable connection structure of claim 5, wherein the first section and the second section are formed by a single elastic tubular member. The power cable connection structure of claim 5, wherein at least the first section is formed by a plurality of elastic-like tubular members. The power cable connection structure of any one of claims 5 to 7, further comprising a waterproof member disposed on the cable jacket. The power cable connection structure of claim 8, wherein the waterproof member is positioned at a fixed distance closer to a proximal end side of the power cable than the boundary portion, and one of the waterproof members is positioned opposite The position of one of the first sections is offset in a longitudinal direction of one of the power cables. A power cable connection structure assembly method for covering a power cable using a cover processing tool, the cover processing tool comprising a tubular hollow diameter expansion holding member that can be pulled out, and held in an expanded state One of the outer circumferential sides of the diameter expansion holding member is elastic like a tubular member, and the power cable connection structure assembling method comprises: processing the power cable to connect the cable shielding layer and the cable sheath from one end in the stated order a step of exposing the end side; a step of installing the diameter expansion holding member on the power cable to cover a boundary portion of the cable shielding layer and the cable sheath; and a holding by expanding the diameter expansion a member for tightening the elastic-like tubular member to cover the power cable with the tightened elastic-like tubular member and forming a first section and a second section along the power cable One Positioning in a longitudinal direction and capable of covering the cable shielding layer and a boundary section of the cable sheath, the second section being adjacent to the first section, disposed along a longitudinal direction of the power cable and having a Below the elasticity of the first section. A terminal processing method for further covering a second elastic-like tubular member in a power cable connection structure, the power cable connection structure including a first elastic-like tubular member covering a power cable, the power cable The wire is processed such that a cable shielding layer and a cable sheath are exposed from the one end side in the stated sequence, the terminal processing method comprising: mounting a diameter expansion holding member on the first elastic tubular member, Thereby covering the position corresponding to one of the boundary portions of the cable shielding layer and the cable sheath by using a covering processing tool, the covering processing tool comprising a tubular hollow diameter expansion which can be pulled out a holding member and the second elastic-like tubular member held on an outer peripheral side of one of the diameter-expandable holding members in an expanded state; and a second elastic-like tubular member by tightening the diameter-expandable holding member, thereby The step of covering the power cable with the first elastic-like tubular member via the first elastic-like tubular member, wherein in the covering step, the first The tubular member and the second elastic tubular member form a first section disposed along a longitudinal direction of the power cable and capable of covering the cable shielding layer and one of the cable sheaths a boundary section, and any one of the first elastic-like tubular member or the second elastic-like tubular member forms a second section adjacent to the first section along the power cable One of the wires is disposed longitudinally and has a lower elasticity than the first segment. A terminal processing method for further covering a second elastic-like tubular member in a power cable connection structure, the power cable connection structure including an electric cover One of the force cables is first elastically shaped like a tubular member, and the power cable is processed such that a cable shielding layer and a cable sheath are exposed from the one end side in the stated sequence. The terminal processing method includes: Providing a diameter expansion retaining member on the first elastically-like tubular member, thereby covering a position corresponding to a position of a boundary portion of the cable shielding layer and the cable sheath by using a covering processing tool, The covering treatment tool includes a second elastic-like tubular member that can be pulled out like a tubular hollow diameter expansion holding member and held on an outer peripheral side of one of the diameter expansion holding members in an expanded state; and one by removing the Diametrically expanding the retaining member to tighten the second elastically-like tubular member, thereby covering the power cable with the first elastic-like tubular member via the first elastic-like tubular member, wherein in the covering step, the An elastic tubular member and the second elastic tubular member form a section disposed along a longitudinal direction of the power cable and capable of covering the cable shielding layer and the One of the sheath boundary line segment.